vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2025-21617

Guzzle OAuth Subscriber has insufficient nonce entropy

MEDIUM
6.3
CVSS Score
Published: January 6, 2025 at 07:23 PM UTC
Updated: June 17, 2026 at 08:43 AM UTC
1 product affected across 1 vendorGuzzle OAuth Subscriber

Using oauth-subscriber by guzzle?

Get instant alerts when new vulnerabilities affect oauth-subscriber - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
MEDIUM6.3
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

Guzzle OAuth Subscriber signs Guzzle requests using OAuth 1.0. Prior to 0.8.1, Nonce generation does not use sufficient entropy nor a cryptographically secure pseudorandom source. This can leave servers vulnerable to replay attacks when TLS is not used. This vulnerability is fixed in 0.8.1.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Guzzle OAuth Subscriber· Guzzle
60%
v < 0.8.1
Affected range stops below 0.8.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

x_refsource_MISC
Source: [email protected]
https://github.com/guzzle/oauth-subscriber/blob/0.8.0/src/Oauth1.php#L192
x_refsource_MISC
Source: [email protected]
https://github.com/guzzle/oauth-subscriber/commit/92b619b03bd21396e51c62e6bce83467d2ce8f53
x_refsource_MISC
Source: [email protected]
https://github.com/guzzle/oauth-subscriber/releases/tag/0.8.1
x_refsource_CONFIRM
Source: [email protected]
https://github.com/guzzle/oauth-subscriber/security/advisories/GHSA-237r-r8m4-4q88

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.3MEDIUMGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-338

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card